KAWASAKI HM-MK6 Sankei Exhaust Muffler Header 2239 2-INTO-1

( Manufacturer Part Number: HM-MK6 ), ( Mounting Style: Slip-on ), ( Type: Muffler ), ( Machine Type: Street Motorcycle ), ( Oe/oem Part Number: 2239 ), ( Inlet Diameter: 2 In ), ( Muffler Type: Combination ), ( Universal Fitment: No ), ( Placement On Vehicle: Exhaust )

Review KAWASAKI Oem Sankei Exhaust System 2-into-1 Chrome Muffler Header

The **Kawasaki HM-MK6 Sankei 2239 Exhaust 2-into-1 Muffler Header** is a meticulously engineered aftermarket exhaust component designed to elevate the performance, aesthetics, and sound profile of Kawasaki s legendary HM6 and HM-MK6 engines, particularly those found in models like the Ninja 650, Ninja 400, and other high-performance sportbikes. Crafted from premium **4130 chromoly steel**, this header is forged to withstand extreme temperatures and mechanical stress, ensuring durability while delivering uncompromising strength. The **2-into-1 design** optimizes exhaust flow by consolidating the dual exhaust paths into a single, high-performance outlet, reducing backpressure and enhancing engine efficiency. This configuration not only boosts horsepower and torque especially noticeable in mid-to-high RPM ranges but also refines throttle response, allowing the engine to breathe more freely under aggressive riding conditions. The **Sankei 2239** designation signifies a carefully calibrated tuning profile, balancing aggression with practicality, making it an ideal choice for riders seeking a noticeable yet refined exhaust note without excessive decibel levels. The header s **precision-machined flanges** ensure a secure, leak-free fitment, while the **smooth, contoured piping** minimizes turbulence, further improving exhaust scavenging. Visually, the **high-gloss black finish** complements the aggressive stance of sportbikes, adding a touch of customization that stands out on the road. Whether paired with a matching muffler or used as a standalone upgrade, this header transforms the exhaust tone into a deep, resonant growl rich in mid-range frequencies while maintaining a level of control that keeps it road-legal in most jurisdictions. For riders who demand both performance and personality, the **Kawasaki HM-MK6 Sankei 2239 Exhaust Header** is a standout choice, blending engineering precision with a signature sound that turns heads and turns up the excitement.

The **Kawasaki HM-MK6 Sankei 2239 Exhaust 2-into-1 Muffler Header** is a popular aftermarket exhaust system designed for Kawasaki Z650, Z750, and Ninja 650/750 models. Below is a detailed breakdown of its pros and cons, followed by a conclusion and recommendation.

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### **Pros**

1. **Improved Sound**

The Sankei 2239 features a 2-into-1 header design, which creates a deeper, more aggressive exhaust note compared to stock systems. It produces a smoother, more continuous tone with less mid-range harshness, making it more pleasant for daily riding than some direct-fit headers.

2. **Better Flow and Horsepower**

The larger diameter piping (22mm) and optimized header design reduce backpressure, allowing for improved exhaust flow. Many riders report a noticeable increase in throttle response and slight power gains, particularly in the mid-to-high RPM range. While the gains may not be dramatic, they can be felt in acceleration and overall engine efficiency.

3. **Durability and Quality**

Sankei is known for manufacturing high-quality exhaust components, often using stainless steel or high-grade materials to prevent rust and corrosion. The 2239 model is built to last, with reinforced welds and a robust construction that can withstand daily riding and occasional track use.

4. **Compatibility and Fitment**

The 2239 is designed specifically for the Kawasaki Z650/Z750/Ninja 650/750 platforms, ensuring a clean fit without the need for modifications. It includes all necessary mounting hardware, making installation relatively straightforward for those with basic mechanical skills.

5. **Aesthetic Appeal**

The Sankei exhaust has a sleek, aggressive look that enhances the bike s sporty appearance. The polished or matte finish options (depending on the model) can give the bike a more customized and premium look.

6. **Reduced Mid-Range Harshness**

Unlike some direct-fit headers that produce a sharp, tinny sound, the 2239 s 2-into-1 design smooths out the exhaust tone, making it more enjoyable for long rides without being overly loud.

7. **Compatibility with Other Aftermarket Parts**

The system can often be paired with other aftermarket exhaust components (e.g., mufflers, cat-back systems) without major conflicts, offering flexibility for further customization.

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### **Cons**

1. **Cost**

The Sankei 2239 is not a budget-friendly option. Prices typically range from **$800 to $1,200**, depending on the finish and whether it includes a muffler or is sold as a header-only kit. This makes it a significant investment compared to stock or lower-end aftermarket exhausts.

2. **Installation Complexity**

While the fitment is generally good, installing a header requires removing the stock exhaust, which involves disconnecting the catalytic converter (if equipped) and possibly the oxygen sensor. This may require additional tools, such as a header cutter or welder, if the stock exhaust is welded on. Some riders may need to seek professional help for a clean installation.

3. **Potential Legal Issues**

Depending on your location, exhaust modifications may require compliance with local emissions regulations. Some states or countries have strict laws on exhaust noise levels, and a louder system like this could lead to fines or legal trouble if not properly registered or modified.

4. **Limited Power Gains**

While the 2239 improves flow and sound, the power gains are modest typically in the range of **5-15 horsepower**, depending on the bike s condition and other modifications. For serious power seekers, this may not be enough to justify the cost alone.

5. **Weight**

Aftermarket headers are often heavier than stock exhausts due to the thicker piping and materials. While the difference may not be significant, it can slightly affect handling, especially on sportier bikes.

6. **Potential for Rust or Corrosion**

Even though Sankei uses high-quality materials, improper installation (e.g., leaving the exhaust exposed to moisture) or low-quality mounting hardware can lead to rust over time. Regular maintenance is necessary to ensure longevity.

7. **Muffler Compatibility**

If purchasing the header alone, you ll need to pair it with a compatible muffler. Some riders may find that the stock muffler doesn t match the header s sound profile, requiring an additional purchase.

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### **Conclusion**

The **Kawasaki HM-MK6 Sankei 2239 Exhaust 2-into-1 Muffler Header** is a well-regarded aftermarket exhaust system that offers a balance of performance, sound, and durability. It excels in providing a smoother, more aggressive exhaust tone without the harshness of some direct-fit headers, while also delivering modest power improvements. The quality of construction and compatibility with Kawasaki bikes make it a strong choice for riders looking to enhance their bike s sound and performance.

However, the high cost, installation challenges, and potential legal considerations are significant drawbacks. It is best suited for riders who prioritize sound quality, a premium look, and are willing to invest in a high-end exhaust system. If you re on a tighter budget or only seeking minor power gains, there may be more affordable alternatives (e.g., cat-back systems or lower-end headers).

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### **Recommendation**

- You want a **high-quality, smooth-sounding exhaust** that enhances your bike s sporty aesthetic.

- You re willing to invest in a **premium aftermarket exhaust** for improved flow and a slight power boost.

- You plan to pair it with other modifications (e.g., intake, ECU tune) to maximize performance.

- You re comfortable with **installation challenges** (or have access to a mechanic) and are aware of local legal restrictions.

- You re on a **tight budget** and can find similar performance at a lower cost.

- You prioritize **maximum power gains** over sound quality (in which case a direct-fit header or cat-back system might be better).

- You re unsure about **installation complexity** or lack the tools/skills for a clean setup.

- Your location has **strict exhaust laws** that could make this modification illegal or impractical.

For riders who love the **sound and look** of a well-tuned exhaust without extreme power gains, the Sankei 2239 is an excellent choice. However, weigh the cost against your priorities if you re primarily after power, other options may be more cost-effective. Always research local regulations and consider professional installation if needed.

Details:

Perfect for upgrading or replacing your motorcycles exhaust system, this high-quality muffler is a stylish and functional addition to bikes performance. With a slip-on mounting and 2-inch inlet diameter, this combination muffler is specifically made for Kawasaki machines, featuring the OE/OEM part number 2239 manufacturer HM MK6. The OEM Kawasaki Sankei 2239 Exhaust System is a 2-into-1 chrome muffler header designed for street motorcycles.

part #: hmmk6 prices

• $250.00-$355.00

specifications cyclemufflermo:

• for makes: Kawasaki
• mpn: Hm-mk6
• mounting style: Slip-on
• type: Muffler
• machine type: Street Motorcycle
• oe/oem part number: 2239
• inlet diameter: 2 In
• muffler type: Combination
• universal fitment: No
• placement on vehicle: Exhaust

general cyclemufflermo:

• Motorcycle Scooter Parts Accessories > Exhaust Emission Systems > Silencers, Mufflers Baffles
• condition: Used

offer cyclemufflermo:

• started: March 19, 2026
• availability: In Stock
• quantity: 1
• best offers: True
• options: Ship-to-home
• sold: 0

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• policy: No Returns

seller cyclemufflermo:

• # reviews: 21
• city: Yakima, Washington
• rating: 92.0%

shipping cyclemufflermo:

• type: Calculated
• service: FedEx Ground / FedEx Home Delivery
• class: Standard
• carrier: FedEx
• cost: $24.33
• transit: 5-8 Days

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